public class Main {
    public static void main(String[] args) {
        String name ="JackYang";
        if(name == "Jack"){
            System.out.println("helloWorld！"+name);
        }
        else if (name == "Yang")
            System.out.println("Hello world!");
        else
            System.out.println("Not Found The JackYang ! ");
    }
}
//if(boolean)to do;

/*
if(boolean)if
        {
        // TODO: 2022/4/19
        }
else
        {
        // TODO: 2022/4/19
        }*/
/*
if(boolean)嵌套if
        {
            if(boolean){
                todo
        }
        }
*/
